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问题: It's the fifth time_____shanghai

It's the fifth time_____shanghai
A.that I have visited B. that I visited
C. when I visited D. when I have visited
答案选A。
1 为什么用完成时?
2 为什么用that 不用when?
3Q

解答:

It's the first time that I have visited Shanghai==I have visited five times/(for)the fifth time.可以把它看作固定句型,但它是强调句型。